JP3216025B2 - Control device for numerically controlled machine tools - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a group of numerically controlled machine tools which mounts a work on a pallet and transfers the work to a numerically controlled machine tool for automatic machining.

[0002]

2. Description of the Related Art In order to automatically process a work by a machine tool, a loading station for mounting the work on a pallet and a buffer station for temporarily storing the pallet on which the work is mounted are provided. There is a device that realizes unmanned machining by automatically carrying a pallet from a buffer station to a machine tool by a transport trolley. Some of these apparatuses have a function of automatically selecting a work loading pallet by inputting a work input order in advance and returning the work to a loading station. In an apparatus having this function, when a pallet for mounting a work according to the loading order cannot be returned to the loading station because the pallet is in use, (1) wait until processing of the pallet is completed and the pallet becomes usable. (2) Return the pallet for mounting the workpiece in the next loading order, overtaking the loading sequence.
One of the operations can be selected.

[0003]

In the apparatus having the above function, the input work is processed and then returned to the loading station for changing the work when the next same type of work is input. Therefore, in the case of mass production of small products, the work that has been processed is efficiently returned to the loading station. However, since this type of device has been developed for efficiently processing a small number of workpieces of various types, it is often used under such conditions. In the case of this multi-kind machining, it is unstable when the "input of the next same work" occurs. In the case of small-volume machining, for example, when machining only two workpieces, the first workpiece is put in, and when this machining is completed, the first workpiece that has been machined is mounted on the loading station to attach the second workpiece. However, there is a problem in that the second work is placed in the line forever because there is no plan to input the subsequent work even after the processing is completed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to give priority to the input of a work while keeping a work completed for a long time in a line. An object of the present invention is to provide a control device for a group of numerically controlled machine tools that can eliminate the problem.

[0005]

As shown in FIG. 1, the construction of the invention for solving the above-mentioned problem is as follows: a plurality of numerically controlled machine tools MA and a transport trolley 11 for transporting a pallet P on which a work is mounted. And a loading station LS for mounting a work on the pallet, and a control device for a group of numerically controlled machine tools that controls the transfer of the pallet P by a computer, and holds information on a work input sequence. Loading order holding means 1, pallet information holding means 2 for holding information on whether or not the pallet P has been processed, and a pallet for mounting a work in accordance with the loading order held by the loading order holding means 1. The mounting pallet selecting means 3 to be selected and the pallet selected by the mounting pallet selecting means 3 have been processed. Determines pallet determining means whether Luke based on the information of the palette information holding means 2 4
If it is determined that the processing of the pallet selected by the pallet determining means 4 has been completed, it is determined that the pallet should be returned to the loading station, and it is determined that the processing of the pallet has not been completed. In this case, a pallet which has already been processed based on the information of the pallet information holding means 2 and which does not occur within the set order in which the workpieces are input based on the input order holding means 1 is selected. And a pallet determining means 5 for determining that the pallet is returned to the loading station.

[0006]

According to the above arrangement, the loading order holding means 1 holds the loading order of the workpieces, and the pallet information holding means 2 holds information on whether or not pallet processing has been performed. Then, the mounting pallet selecting means 3 first selects a pallet to which the work can be mounted in order to load the work in accordance with the charging order held in the charging order holding means 1, and then the pallet determining means 4 selects the pallet. Is determined based on the information held in the pallet information holding means 2 to confirm whether or not processing has been completed. When the processing of the selected pallet has been completed, the selected pallet is returned to the loading station, and the work is loaded according to the above-described loading sequence. On the other hand, if the selected pallet has not been processed and cannot be returned to the loading station, the pallet which has already been processed based on the information of the pallet information holding means 2 Select a pallet in which the input of the work based on the order does not occur in the set order, that is, a pallet which is not returned for the input of the work for a while, and returns the selected pallet to the loading station to receive the processed work. Perform recovery. In this way, when the pallet for loading the work cannot be returned to the loading station according to the loading order, the pallet which has been processed and which has not been returned to the loading station for a while depending on the loading order. Select and return to the loading station to remove the processed work.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a numerical control machine tool control apparatus according to the present invention will be described below with reference to the drawings. FIG.
1 shows a transport line 10 for transporting a pallet P on which a work is mounted by a transporter 11 of a stacker crane type. Along the transfer line 10, the machine tool MA
1, MA2, MA3, a loading station LS, and a buffer station BS are arranged. The pallet No. assigned to the pallet P is provided on the transport cart 11. A pallet inspection device 12 for reading the data is provided. Each machine tool MA1, MA2, MA3 is provided with a pallet loading / unloading device PC1, PC2, PC3, and these pallet loading / unloading devices PC1, PC2, PC
3, the machine tools MA1, MA2, MA3 carry the pallet P to and from the carrier cart 11.

The buffer station BS is divided along the transfer line 10 into a total of 21 rows, 7 rows and 3 columns. Is given. And this shelf No. Is the pallet No. of the pallet P. And one-to-one. Pallet P
Is the pallet No. The type of work to be attached is determined.

Next, the configuration of the control system of this embodiment will be described. The numerical control device NC provided corresponding to each of the machine tools MA1, MA2, MA3 includes a storage device 2
0, which is connected to the management device 21 composed of a computer having the pallet No. 0 and transferred from the management device 21. Are held, and a plurality of workpieces mounted on the pallet P are machined based on the numerical control data. The pallet No. of the pallet conveyed by the carrier 11 is provided to each numerical controller NC.
Is transferred from the management device 21. The management device 21 is further connected to the transport trolley 11, the buffer station BS, and the operation panel 22, controls the transfer of the pallet P between each of the loading station LS and the buffer station BS, and controls the buffer station BS and the machine tools MA1, The transfer of the pallet P is controlled between each of MA2 and MA3. on the other hand,
As shown in FIG. 3, the operation panel 22 includes a display device 23 and a mounting completion switch 25 that is pressed when the mounting of the work on the pallet P is completed. The display device 23 indicates to a worker a work to be mounted on the pallet P carried into the loading station LS, based on work mounting data described later.

The storage device 2 connected to the management device 21
0 stores various data for controlling the numerically controlled machine tool group. As an area for holding this data, a work data area WDE for holding work data relating to types of NC data corresponding to a work part number, machine groups that can be machined, and the like, and pallet data for work that can be attached to each pallet. A pallet data area PDE to be processed, a production data area MDE for holding production data relating to the order of input (processing) of the workpiece to be processed and the number of processing, and machine state data relating to states of MA1, MA2, and MA3 of the machine tool. A machine state data area MIE for storing, a pallet position data area PIE for storing pallet position data relating to the destination of the pallet P, and a machine group data area MGE for holding machine group data for classifying machine tools capable of performing similar processing. ,palette There the working order list area PSE for storing machining sequence list for the order of processing, and priority order list area USE for storing priority order list for priority order to return the processed pallet P is.

The work data stored in the work data area WDE of the storage device 20 includes, for each work, a “work No.” field, a “work part number” field, a pallet P And a column of "NC data" at the time of performing the machining, and the column of the "posture" indicates a machine tool group capable of performing the machining in the posture. Group "G
An "R" column and a "first" column instructing how to perform processing when the workpiece is a first product are provided. This work data is created by the operator inputting data relating to the work in the respective columns. When "1" is set in the "first" column, the apparatus of this embodiment is
Stops when the first first work is carried into the machine, turns on the operator call, calls the operator,
When "2" is set, the work is stopped and an operator call is made every time the work is carried into the machine as a permanent first product.

As shown in FIG. 5, the pallet data held in the pallet data area PDE of the storage device 20 includes a "No." column, a "Surface" column for attaching a work, and a It consists of a column of "attachment" for setting which position to attach, and columns of "work No.", "article number" and "posture" to be attached. Each pallet used for machining (pallet No. in this embodiment). 401
~ 421) For the work that can be attached to
It is created by an operator inputting data in the above columns. This example shows that only the work of the product number A can be mounted on the pallet 401. However, when a plurality of works can be mounted on the pallet, the “face” to be mounted and the “mounting” position are set for each of the plurality of works. ,
Information on “work No.”, “article number”, and “posture” to be attached is held.

The aforementioned production data area M of the storage device 20
As shown in FIG. 6, the production data held in the DE includes a "No."
o. , A "article number" column of the work, a "planning" column indicating the number of workpieces planned for processing, and a column for each "posture". Then, the schedule is created by setting the order of machining and the number of machining of the work to be machined every day if the schedule is created on a daily basis, or every week if the schedule is created on a weekly basis. This is the data of the production plan. The apparatus according to the present embodiment is configured to sequentially input workpieces in a high input order based on the production data and to perform machining. In addition, this "posture"
Column indicates the total number of workpieces that have been input, and the column “completed” indicates the total number of workpieces that have been processed. The “input” and “completed” are updated as the processing progresses. It has become so.

The production data is stored in an operation panel 22 shown in FIG.
, And a correction instruction can be given by the operation keys 26 of the display device 23 of the operation panel 22. That is, when creating a production plan (production schedule) on a daily or weekly basis as described above, this production data is used in the order of “work N
o. No. of the work to be processed in the column of "". (In this embodiment, by inputting either “work No.” or “part number”, the other is automatically set). It is created by inputting the number of processed workpieces to be processed in the column. Further, in the present embodiment, the “number of overtaking”
Can be entered. That is, in the present embodiment, when a selected work is put into the apparatus in accordance with the input sequence of the production data, when the pallet for mounting the selected work cannot be returned and the input of the work is impossible, the input order of the work is Overtake the lower work. At that time, the number that can be overtaken in the loading order was set as "number of overtakes"
It is. In this embodiment, when the number of overtaking of the work input exceeds the set “number of overtaking”, it is determined that the processed work is the final work instead of collecting the pallet for the work input. The pallet with the work is returned to the loading station LS, and the final work is removed. This processing will be described later in detail.

On the other hand, the machine state data held in the machine state data area MIE of the storage device 20 includes machine tools MA1, MA2, MA3 as shown in FIG.
And the pallet No. currently loaded in each machine tool. In the example of this figure, the “state” “40” of the machine tool “MA1” is included.
7 "indicates that the pallet No. 407 has been loaded into the machine tool MA1, and the" state "of the machine tool" MA2 "
"0" indicates that the pallet is not currently loaded in the machine tool MA2. The pallet position data stored in the pallet position data area PIE of the storage device 20 includes a pallet “No.” column, a “destination” column, and a “state” column, as shown in FIG. "00" in the "destination" column of the pallet is buffer station B
S, “01” is the loading station LS,
“03” indicates a machine tool.
“00” indicates unprocessed, “01” indicates the first step, “02”
Indicates the second step, and “03” indicates the completion of processing. Further, as shown in FIG. 9, the machine group data in the machine group data area MGE includes a “machine group” column classified for each machine tool that can be machined in common, and a “machine” of a machine tool designated by the machine group. No. "column. The processing order list in the processing order list area PSE includes a column of “processing order” and a column of “pallet No.” as shown in FIG. Is registered. Further, the priority order list in the priority order list area USE includes a column of "priority order" and a column of "pallet No." as shown in FIG. Is registered.

With the above configuration, the management device 21 selects a work to be input according to the input sequence of the production data shown in FIG. 6 stored in the storage device 20 and loads the pallet P to which the work can be attached. Returning to the station LS, an instruction to attach the work to the pallet P shown in FIG. 3 is displayed on the display device 23 of the operation panel 22. In accordance with this, the worker mounts the specified work at the mounting position of the pallet P, and presses the mounting completion switch 25 when the mounting is completed. Thereby, the pallet P is conveyed to the machine tools MA1, MA2, and MA3, and processing is started. In this embodiment, when selecting the pallet P to be returned to the loading station LS,
If the pallet to which the work selected on the basis of the input sequence of the production data can be mounted cannot be returned, and the pallet cannot be returned for the selected work, the set number of overtaking can not be returned. Instead of selecting a pallet for the work, a work (final work) that has not been returned for a while among the works that have been processed is selected and returned to the loading station LS to remove the processed work. .

Next, the operation of the management device 21 will be described with reference to FIG.
This will be described in detail with reference to the flowcharts in FIGS. The flowchart of FIG. 12 shows the processing of the management device 21 for returning the pallet P to the loading station. First, here, the process of returning the pallet P to the loading station LS and inputting a work assuming that “2” has been selected as the “number of overtaking” will be described.
In step 101, the variable n is set to 1 and then in step 1
02 is searched for the production data shown in FIG.
o. Work No. set in the column of No. 1 The work of 0001 part number A is extracted. Then, the judgment step 103
Then, based on the production data, it is further checked whether the work of the part number A has reached the planned production number. Here, the input order No. Since the number of production “plans” of the work of the part number A set in the column 1 is “02” and the number of “injected” is “00”, the determination step 103 is No and the next step Proceed to 104. In step 104, a pallet to which a work with the machining part number of the n-th data (here, the work with the part number A) can be attached is searched. That is, FIG.
To find a pallet “No. 401” to which a work of product number A can be attached. Then, in decision step 105, it is determined whether this pallet is in use, that is, pallet No. The pallet 40 corresponding to the pallet position data shown in FIG.
Confirm by searching for “state” of No. 1. Here, since the “state” of the pallet 401 is “03”, that is, the processing has been completed, the determination step 105 becomes No, and the process proceeds to the next step 110.

On the other hand, the pallet 401 to be determined in the determination of whether or not the pallet is in use in the determination step 105
If is not available and Yes, the next decision step 1
At 06, it is determined whether or not the loading order can be overtaken, based on whether or not the “number of overtaking” has reached “2” set above. Here, the input order No. Since the number "overtaking number" of the No. 1 work A is "1", the judgment step 106 becomes "Yes", and the process proceeds to step 108, where 1 is added to the variable n. Then, the process proceeds to a decision step 109, in which it is determined whether or not the mounting of all the workpieces whose production is "planned" is completed based on the number of "inputs" of the production data shown in FIG. If all the workpieces have been mounted (judgment step 109 is Yes), all the processing is completed. On the other hand, if the mounting has not been completed yet (judgment step 109 is No), the process returns to step 102 and a new process is performed. A work is selected, and the processing after step 103 is continued. This process is the same when the determination target work reaches the planned number in the determination of whether or not the production planned number has been reached in the above-described determination step 103 and the result is Yes.

If the determination in step 105 above is "No", the process proceeds to step 110, and the pallet 401 is conveyed to the loading station LS. Next, the process proceeds to step 111 to extract another work that can be further mounted on the pallet 401 to which the work of the product number A selected in step 102 described above is mounted. In other words, when the pallet data shown in FIG. 5 is searched, and there is a work that can be further attached to the pallet in addition to the work of the product number A, information on the work is acquired, and the operator is instructed to attach the work to the pallet. Create work installation data. Then, in step 112, the display device 2 of the operation panel 22 shown in FIG.
3, pallet mounting "face" and "mounting" position,
Perform a list display of the "part number" of the work.

In accordance with the list display, the operator mounts the specified "article number" work at the "mounting" position of the specified "surface" of the pallet 401 conveyed to the loading station LS in the above-described step 110. And
When the mounting is completed and the operator presses the mounting completion switch 25 of the operation panel 22 shown in FIG.
3 is Yes), and the processing order of the pallet 401 is as shown in FIG.
(Step 114).
The pallet is conveyed to the buffer station BS and one processing routine is completed, and the process returns to step 101 to start the processing of loading the workpiece in the next loading order.

Next, in the judgment step 106 in the flowchart of FIG. 12, if the overtaking cannot be performed, for example, the order of the loading sequence No. in the production data shown in FIG. The pallet 401 to which the part number A work is to be mounted when the first part number A work is put in use (judgment step 1)
05 is Yes), the order of putting in the part number A work is overtaken by one (judgment step 106 is Yes).
9, in step 102, the next charging order No. Work No. 2 [0003] Even when the work of the product number C is put in, if the pallet to which the work of the product number C can be mounted is also in use (Yes in the determination step 105), the work order is further overtaken and the work is overtaken by selecting the work. Is “2”
And becomes equal to the set “number of overtaking” “2”.
In such a case, it is determined that overtaking is impossible, and the determination in step 106 is No.
Instead of returning the pallet to load the workpieces in the loading order, select the final workpiece from among the processed pallets currently in the line, and transfer the pallet on which the final workpiece is mounted to the loading station. Return to the LS and collect the processed work. Here, the final work is a work that has been returned to the loading station LS for a while (for example, processing is not started during the same day) depending on the pallet return process according to the loading order in the processed work as described above. No work means.

The processing in step 107 is shown in FIG.
This will be described in detail with reference to FIG. First, in step 301, the variable j is set to 1. In step 302, the j-th data in the priority order list shown in FIG. 409 are obtained. At this time, it is determined in a determination step 303 whether or not the j-th pallet is on the priority order list. Here, it is assumed that the j-th pallet exists (No in determination step 303). Next, in determination step 304, it is determined whether or not the machining of the j-th pallet is completed with reference to the "state" column of the pallet position data shown in FIG. Here, it is assumed that the processing of the pallet 409 has been completed (Yes in the determination step 304).
Then, in step 305, the work attached to the pallet 409, which is the j-th pallet, is obtained by searching the work attachment data shown in FIG. 3, and it is determined whether or not this work is the final work in the following processing. And Here, the pallet No. It is assumed that the work of the product number F is attached to the work 409.

In the next step 306, a work in the next charging order is obtained. That is, the input order No. selected in step 102 of the flowchart shown in FIG. The work to be inserted next to the work of the part number A of No. 1, here, the input order No. The work of the product number C set to 2 is obtained. Then, in the next judgment step 307, this part number C
Is determined to be the same as the work of the part number F, which is the final work. Here, it is determined that they do not match (No in determination step 307), and the flow proceeds to the next determination step 308. In the judgment step 308, the examination of the next work to be put in accordance with the feeding order is referred to as “final judgment number”.
To determine if you have gone to In other words, when returning the pallet on which the final work is mounted, it is assumed that there is no replacement of the work on this pallet for a while. Therefore, the number of work input plans set in accordance with the input order (final determination number) is examined, and it is determined that the work is the final work by confirming that there is no input plan for a while. For this purpose, the processing of step 306 and the determination step 307 are repeated until the “final determination number” is reached. Note that, in order to prevent the pallet on which the work judged to be the final work is attached from being selected as the pallet to which the work is to be input by the overtaking process in the input order, the number of "overtaking"number"
It is assumed that the same “2” is set.

As described above, the examination of the work according to the processing (input) order is performed for the part number C work in the "1" -time next input order, but until the "final judgment number" reaches "2". Since the process has not been performed, the determination step 308 is No, and the process returns to Step 306. Then, in step 306, the production data is searched, and
No. of the loading sequence No. Obtain a work with a product number D of 3. Then, in the judgment step 307, the product number D
Is determined to be the same as the work of the product number F (final work candidate).
Since the answer is “o”, the process proceeds to the determination step 308, and it is determined whether or not the “final determination number” has been reached. In this case, the work to be put in is examined until the work reaches “2” which is set as the “final judgment number”.
8 is Yes and the process proceeds to step 309, where it is determined that the work of the product number F is the final work and the pallet 409 to which the work is attached is returned. Then, in step 310, the pallet 409 is returned to the loading station LS, and the operator removes the workpiece having the product number F, which is a completed product.

On the other hand, in the decision step 304,
If the processing of the selected j-th pallet is not completed (No in decision step 304), or in decision step 307, the work to be put in next coincides with the processed product (final work candidate). If the answer is yes (judgment step 307 is Yes), the process moves to step 311 to add 1 to the variable j, and then returns to step 302,
The next palette in the priority order list shown in FIG. 11 is selected, and the subsequent processing is continued. If all the pallets have been searched and the j-th pallet does not exist (Yes in the determination step 303), the process proceeds to step 312 to determine that there is no final work and there is no return pallet.

Next, the processing by the management device 21 for processing the work attached to the pallet P by the above processing will be described with reference to the flowchart of FIG. First, in step 201, the variable i is set to 1. Then, in step 202, the i-th data in the machining order list shown in FIG. 10 is searched, that is, the first set pallet No. Obtain 401. Next, in step 203, the work mounted on the pallet 401 is
Search the work data shown in and search for a machine group. Here, the pallet No. A search is made that the machining of the workpiece with the product number A attached to 401 is performed by the machine group 1. Next, in step 204, first, the machine tools belonging to the machine group 1 are searched from the machine group data shown in FIG.
Machine tools MA1 and MA2 are obtained. Next, this machine tool M
The machine state data shown in FIG. 7 is searched for the states of A1 and MA2. As a result of this search, since the “state” of the machine tool “MA2” is “0” and is in an empty state, the determination step 205 becomes “Yes”, and the process proceeds to the next step 207. On the other hand, when neither of the machine tools MA1 and MA2 is empty, the judgment step 205 becomes No, and the process proceeds to the step 206, where 1 is added to the variable i, and the process returns to the step 202 to start the process for the next pallet.

If the determination in step 205 is Yes, a processing program for the pallet 401 is generated in the next step 207. This is to extract the corresponding NC data for the work mounted on the pallet 401 in accordance with the work mounting data created in step 111 described above with reference to the flowchart of FIG. Next, the pallet 401 is transported to the machine tool MA2 in step 208, and processing is performed in step 209.
Then, when the processing is completed, in step 210, the "destination" and "state" columns of the pallet of the pallet position data shown in FIG. 8 and the "posture" of the production data shown in FIG.
Change the number of "in" and the number of "complete" in the column of
The processing order list is updated by deleting “401” in the column of “palette No.” selected in the processing order list shown in FIG. At the same time, “401” is added to the “palette No.” column of the priority order list shown in FIG. 11 to update the priority order list. Thus, one routine is completed, and processing of the next pallet is started.

In the above description, the case where only one work is mounted on the pallet has been described for convenience of description, but the present embodiment can also cope with the case where a plurality of works are mounted on the pallet. is there. In this case, in step 305 of FIG. 13, the work attachment data is searched to obtain a plurality of works attached to the pallet. In step 306, a work in the next loading order is obtained, and a work attached together with the work is also obtained.
In 07, it is determined whether or not the plurality of workpieces acquired in step 306 match the machining-completed workpieces that are the final workpiece determination targets. Further, in the above-described embodiment, only one type of work is mounted on the pallet. However, the above-described embodiment can be applied even when a plurality of similar types of work are mounted. In this case, in the process of step 305 in FIG.
A plurality of types of workpieces that can be attached to the j-th pallet are obtained, and in the following processing, the determination on the plurality of types of workpieces is advanced.

In the present invention, it is also possible to give priority to the input of the work in accordance with the input order set in the production data or the collection of the work after the completion of the processing, in the same manner or in order. For example, in the above-described embodiment, the “number of overtaking” and the “final judgment number” are set to the same value of “2”, but the value of the “overtaking number” is changed to a larger value to give priority to the input of the work. In addition, by reducing the value of the “number of overtaking”, it is possible to give priority to the collection of the completed work over the input of the work. (For example, if the number of overtaking is set to 1, if there is no pallet to which the work to be put in with the highest priority at this time is mounted, the final pallet will be collected immediately.)

In the embodiment described above, it is necessary to input the work in accordance with the input sequence set in the production data, and to input the work in a case where the input order must exceed the set "number of overtaking". Instead of returning the pallet for loading the work, it is a work that has been processed and will not be recovered for a while depending on the loading sequence of the work according to the production data (final work)
Is returned to the loading station LS. Thereby, the completed workpiece can be promptly collected.

In the conventional apparatus, when one workpiece is processed in a plurality of postures, for example, the input sequence No. of the production data shown in FIG. Like the work of part number A of 1,
When two pieces are machined across the posture 1 and the posture 2, the pallet 4 is formed when the first work is completed in the posture 1.
01 is returned to the loading station LS, and the second work is input. However, after the machining is completed, there is no plan to input a subsequent work, that is, the third work is input. Is not carried out, the vehicle stays in the line without returning to the loading station LS. For this reason, there has been a problem that the machining in the posture 2 cannot be started quickly even if the machining in the posture 1 is completed. On the other hand, in the present embodiment, if it is determined that this is the final work after processing the second work in the posture 1, the work is returned to the loading station LS, so that the processing in the posture 2 can be started quickly. There are advantages too.

[0032]

The present invention is constructed as described above, and the work which has been processed remains in the line for a long time while the work is put into the apparatus first in order to improve the efficiency of the apparatus. And the time required to complete the processing of all the workpieces can be reduced.

[Brief description of the drawings]

FIG. 1 is a configuration diagram for clearly illustrating the present invention.

FIG. 2 is an overall configuration diagram of a numerically controlled machine tool group according to one embodiment of the present invention.

FIG. 3 is an external view of an operation panel displaying contents of work attachment data.

FIG. 4 is a diagram showing contents of work data.

FIG. 5 is a diagram showing the contents of pallet data.

FIG. 6 is a diagram showing the contents of production data.

FIG. 7 is a diagram showing contents of machine state data.

FIG. 8 is a diagram showing the contents of pallet position data.

FIG. 9 is a diagram showing contents of machine group data.

FIG. 10 is a diagram illustrating the contents of a processing order list.

FIG. 11 is a diagram illustrating the contents of a priority order list.

FIG. 12 is a flowchart illustrating a pallet return process according to the present embodiment.

FIG. 13 is a flowchart illustrating a final work selection process in the flowchart of FIG. 12;

FIG. 14 is a flowchart illustrating the processing operation of the present embodiment.

[Explanation of symbols]

 Reference Signs List 10 transport line 11 transport trolley 12 pallet inspection device 20 storage device 21 management device 22 operation panel 23 display device LS loading station BS buffer station MA1, MA2, MA3 machine tool

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-62-88559 (JP, A) JP-A-3-170254 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B23Q 41/00 G05B 19/418

Claims (1)

(57) [Claims] 1. A plurality of numerically controlled machine tools, a transport trolley for transporting a pallet on which a work is mounted, a loading station for mounting the work on the pallet, and a buffer station for storing the pallet
With the door, equipped with unmachined workpiece to wait in the buffer station
Pallets are transferred from the buffer station to the machine tool.
After processing the unprocessed workpiece, the machine tool
Transported to the factory , stored, and then loaded at the loading station
When it is time to
If the pallet loaded with the work is
Transported to the loading station
Machined seen workpiece is removed that, instead, the next unprocessed workpiece to be turned is mounted, is conveyed to the buffer station, a control device of stored numerically controlled machine group, the information about the order of feeding the workpiece Loading order holding means for holding, pallet information holding means for holding information on whether or not pallet processing has been performed; mounting for selecting a pallet for mounting a work in accordance with the loading order held in the loading order holding means Pallet selecting means, pallet determining means for determining whether or not the pallet selected by the mounting pallet selecting means has been processed, based on information of the pallet information holding means, and pallet selected by the pallet determining means. If it is determined that the pallet has been processed, return the pallet to the loading station. And if it is determined that the processing of the pallet has not been completed, the pallet has already been processed based on the information of the pallet information holding means, Pallet determining means for selecting a pallet in which the input does not occur within the set order, and determining to return the selected pallet to the loading station , wherein the input is set based on the determination of the pallet determining means.
Loading station for pallets that do not occur within the order
And remove the machined work from the pallet
After that, transfer the pallet to the loading station again
Numerically controlled machine tool group control device, characterized in that you store and conveyed.